Boiler construction



F. 1.. CORMIER BOILER CONSTRUCTION Filed March 10, less Fqb. 13,1940.

M m Wm C @U L the features of construction herein de'scribedand one form of which is illustrated in the accomf Patented Feb. 13, 1 94 0 BOILER CONSTRUCTION Frank L'. Cormier, East Braintrec, Mass., assignor to Massachusetts Engineering 00., Inc.,

North Quincy, Mass, a corporation of Massachusetts Application March 10, 1938, Serial No. 195,115 I v I I v -8Claims. (Cl. 29-1514) This invention relatesto boilerconstruction and more particularlyto low pressure horizontal fire-boxyboilers for heating purposes. boilers ordinarily comprise a cylindrical water chamber portion and a rectangular fire-box at one-endof such portion and beneath an extended part of the water chamber.. The primary object of my invention residesin animproved boiler construction of this nature and in the novel method of producing the same.

In accordance with one aspect of my invention I form the outer shell of the boiler, including both the cylinder and fire-box portions, from a single sheet metal blank. The blank is first sheared inwardly from two opposite edges. The unsheared portion is then curved to arcuate configuration after which two wings of one sheared.

portion are curved to form a cylinder together with the curved unsheared portion, and the other two wings of the sheared portion are broughtinto. parallelism to "form the side walls of the fire-box.

This novel boilershell and the method of producing the same comprises one of the objects of my invention.

A further object of the production of a novel U-shapedinember also con-. structed from a single sheet'metal blank and adapted to cooperate with the above mentioned shell to form an outer wall of the boiler and-a flue'sheet for the fire-box. This U-shaped member isadapted to be joined tothe shell and other preshaped and cooperating pieces are: likewise adapted to 'be joined thereto in a convenient and relatively simple manner to form the fire-box and provide a water jacket for the walls thereof incommunication with the water chamber.

With the above and other objects in-view as] will hereinafter appear my invention consists in panying drawing wherein: Fig, 1 is a side elevation of my invention.

' Fig. 21s a rear end elevation thereof. M Fig. 3 is a cross sectional view taken on line.

3-3 of Fig. 1.

-. Fig. 4 is. a longitudinal sectionalview taken on linef44 of Fig. 2.

' Fig. 5 is a'plan sectional view taken on line 55 of Figvl.

Fig. 6 is a plan/view of a flat steel sheet usedto form the outerlshell of the boiler.

, Fig. '7 is a perspective view of the boilershell formed from. this sheet.

Fig. 8 is a plan view of a flat "sheet used to form Thesev invention resides the this portion having as indicated at 30.; After being formed to the box. J In a boiler embodying s 2 4 is joined to the front end of the cylinder .at

a U-shaped member to provide anouter wall for the boiler and a flue sheet for the fire-box;

Fig. 9 is a perspective view of the U-shaped member thus formed..

Figs. 10-13 are perspective views of filler pieces v used to complete the fire-box.

Referring first to the construction of the outershell of the boiler, l0 indicates a flat sheet metalblank of rectangular shape. I shear this blank inwardly along a'common axis at l2 from'opposite edges of the blank, leaving an unsheared intermediate portion, this intermediate portion is then curved to arcuate shape, as shown in Fig.7, and 'such'cur'vature is continued throughout the two Wings 14 of the blank to form a cylinder H5.

The other two wings I8'are brought into paralv lelism'to form the side walls of the fire-box poir-I tion of the shell, this portion being that part'of th boiler rearwardly of the cylindrical portion and containing'the fire box chamber. The two leading edges of the wings Mare joined together 3 in any suitable manner.v

In Fig. ,8 is illustrated a second flat sheet metal blank 20 having a wider end portion'22 arcuately recessed at 24 to a curvature corresponding to the curvature of theshell cylinder IS. The other end portion 26 of this blank is relatively narrower and'is apertured at 28 to receive the boiler tubes, its end edgeconvexly curved condition shown in Fig. 8, this blank is bent to the U-shape shown in Fig. 9 wherein the blank embodiesjtwo parallel end portions 22 and 26' and an intermediate connecting portion 32, the

blank being bent along the broken lines shown in Fig.8."

' The U-shaped blank is so assembled to the outer boiler shell that the endportion 22 and intermediate portion 32 respectively provide front and bottom walls of'the water chamber, and the end portion 26 provides a flue sheet in the fireits assembled relation, the ar-cu ate edge 34 and the side edges 36 are joined to the edges of the wings l8 at 38, as by welding. Thefirebox is then completed by joining side pieces 40 to the'flue sheet 26 and tothe wings M3,, the

edges 42 of the pieces "40 being joined'to the edges '44 of the flue sheet and the flanged edges lfibeing joined to" the bottom and front edges 48 of the wings |8. A curved top plate 50 is joined to the curved edge 30 of the flue sheet and along its encl edges 52 'to the top edges 5 of the pieces 40. Thus the fire-box is completed and a water jacket open to the main wat r h mber i the rear end of the water chamber is closed by a plate 66. It will now be apparent that I have produced a superior boiler of the nature herein disclosed" by a novel and ingenious method which results not only in a great saving'in time, labor and material but which also produces a superior product.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. The method of forming the outer shell of a boiler having a cylindrical portion. and: an adjacent fire-box portion, which comprises shear ing a suitable sheet-metal blank inwardly from two opposite edges to form two wings at each of said edges, bending one portion of the blank together with the attached two wings to: form a cylinder and utilizing the other portion of the blank together with the attached two wings to form the fire-box portion of the shell.

2; The method of forming the outer shell of -a boiler having a cylindrical portion and an adjacent fir'e' b'ox portion, which comprises shearing a'sui'tab'le sheet m'etal blank inwardly along a common axis from two opposite edgesto form two wings at each or said edges, bending one portion of the blank together with the attached two" wings to form a cylinder, and placing the other two wings in parallelism toform the side 1 walls of the fire-box portion of the shell. 40'

3. The method of forming the outer shell'oi a boiler having a cylindrical portion and an adjacent fire-box portion, which comprises shear-j 1 ing a suitable sheet metal blank inwardly along a common axisfrom two opposite edges to-form two Wings at each of said edges, bending the unsheared intermediate portion of the: blank to arcuate configuration, bending two oppositely dis: posed wings to conform to said configuration and form a cylinder with the intermediate portion of the blank, and continuing the other two into parallelism beyond and tangentially of said arc.

- 4. The method of constructing a boiler, which comprises forming from a single piece of sheet metal an outer shell having a cylindrical portion and an-adjacent fire-box portion with parallel side walls, providing a sheet metal blank with one end arcuately recessed to correspond to the curvature of said cylindrical portion of the shell andthe other end portion apertured toreceive and support one end of the boiler tubes,

bending the blank to U-shape with the two end portions inspaced and parallel relation, and as sembling the blank and shell by joining said-recessed portion of'the blank to the cylindrical portion and side walls of the shell in position where? in the apertured end portion of the blank forms the flue sheet of the fire-box. L

5. The method of constructing a boiler, which I comprises forming an'outer shellhaving a cylina drical portion and an adjacent fire-box portion with parallel side walls, arcuately recessing onev end of a sheet metal blank to a curvature corresponding to said cylindrical portion of the shell and aperturing the other, end portion of the blank to receive and support one end of the .boiler tubes, bending the blank'to U -shape with i the two end portions in spaced and parallel relation, assembling the blank and shell'by joining said'recessed portion of the blank to the cylinw drical portion and side walls cithe shell in posi-j tion wherein the aperturedend portion of the blank forms-thefiflue sheet of the fire-box, and

providing inner sheet metal fire-box walls joined to the shell and to the edges of the flue sheet. v 6. A boiler comprising an outer shell having a cylindrical section and a fire-box section formed from a single sheet metal blank having its intermediate portionfcurved to'form the top portion of the boiler and having the ends of one portion of the sheet joined to complete the cylindrical section, the fire-box section; having its-top por tion' integrally attached to and in the same);

curved plane as the top arcuate portion "of the cylindrical: section and having spaced and parallel V s'i'dewallsdntegral therewith, a combined flue sheet and outer wall forming-sheet formed from a single sheet metal blank having its intermediate portion bent to U-shape and providing spaced and parallel end portions, one of said portions" having its free end arcuately recessedand' joined th'erealong to one end ofthe cylindricalv shell and the other portion being apertured to receive the ends ofboiler tubes and forming the fluesheet of the fire-box, and means cooperating and joined to the edges of" said flue sheet'for providing water jacketing top and" side walls for the fire box'. v e

v 7. Aboiler comprising an outer shell having a cylindrical section and a fire box section formed" ironi'a single sheet metalsblank having its-in;

terme'diate portion curved'to form the top portion! of the boiler and havingthe ends of oneportion oi the sheet joined to complete the cylindrical section, the fire box section having its top tion curved tocorrespond to the cylindrical sectionand having spaced and parallel side wall-s integrai therewith, a combined flue sheet'and outer wall fanning sheet formed from a single sheet metal blank having its intermediateportion bent toU-shape and providing. spaced and parallel end I portions, one of said endportions having its free end arcuately recessed and joined .therealong to one endv of the cylindrical shell and the other; portion being apertured to receive the ends of' boiler,- tubes andforming afflue sheet of the fire box. a i 8. The boiler defined in claim 7 wherein the in.- termediate and recessed end portions of said \U-shaped blank are wider than the other end portion thereof and are joined along their edges to the shell, and means cooperating with joined to theedges of said flue" sheet for pro viding water jacketing top and sidewalls for the fire box. q FRANK L. QQRMIER. 

